Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP476) that extend into the Lavery Till, and in some cases through the Till into the Kent RecessionalSequence.Groundwater flow is, in general, towards the northeast. Groundwater flows primarily through therelatively permeable layer above the Lavery Till. The Lavery Till is relatively impermeable togroundwater flow; groundwater that does pass vertically through the Lavery Till enters the KentRecessional Sequence.There is known to be a significant amount of buried infrastructure (piping, etc.) associated withthe WMA 1 facilities.A.3 Area HistoryThe WMA 1 area surrounding the Process Building has undergone significant reworking sincethe initiation of NFS activities.Figure A.5 shows WMA 1 in 1962 prior to NFS site development. At this time WMA 1 wasfarmed.Figure A.6 shows WMA 1 in 1966. The bulk of the initial set of NFS buildings was complete bythis time.Figure A.7 shows WMA 1 in 1968. Some additional construction has taken place in the north partof WMA 1. The area around the buildings is grass/bare earth.Figure A.8 shows WMA 1 in 1977. There is some additional construction in the southwest cornerof WMA 1.Figure A.9 shows WMA 1 in 1984. The Vitrification Facility is now present along the northernend of WMA 1. Open areas within WMA 1 still appear to be grass covered/bare earth.Figure A.10 shows WMA 1 in 1995.Figure A.11 shows WMA 1 in 2007. By this time most open areas are paved.Rev. 1 A-3